modapi 0.1.5

Unified API for Modbus communication

ModbusAPI

Unified API for Modbus communication with multiple interfaces: Shell CLI, REST API, and MQTT.

Features

• Modbus RTU Client - Core functionality for communicating with Modbus devices
• Auto-detection - Automatically detect Modbus devices on serial ports
• Multiple APIs:
  • Shell CLI - Command line interface for direct Modbus operations
  • REST API - HTTP API for web applications
  • MQTT API - MQTT interface for IoT applications
• Interactive Mode - Interactive shell for manual Modbus operations
• JSON Output - Structured JSON output for easy parsing

Installation

This project uses Poetry for dependency management.

1. Install Poetry if you haven't already:

   curl -sSL https://install.python-poetry.org | python3 -
   

2. Clone the repository and install dependencies:

   git clone https://github.com/yourusername/modbusapi.git
   cd modbusapi
   poetry install  # Install all dependencies
   
   # Or install with specific groups:
   poetry install --only main,rest  # Only REST API
   poetry install --only main,mqtt  # Only MQTT API
   poetry install --with dev        # Development tools
   

3. Activate the virtual environment:

   poetry shell
   

Development

• Install development dependencies:

  poetry install --with dev
  

• Run tests:

  poetry run pytest
  

• Run with coverage:

  poetry run pytest --cov=modapi tests/
  

Building and Publishing

• Build the package:

  poetry build
  

• Publish to PyPI:

  poetry publish --build
  

Usage

Shell CLI

# Basic commands
modbusapi rc 0 8       # Read 8 coils starting at address 0
modbusapi wc 0 1       # Write value 1 to coil at address 0
modbusapi rh 0 5       # Read 5 holding registers starting at address 0

# With options
modbusapi -v rc 0 8    # Verbose mode
modbusapi -p /dev/ttyACM0 wc 0 1  # Specify port
modbusapi --scan       # Scan for Modbus devices

# Interactive mode
modbusapi --interactive

REST API

from modbusapi import create_rest_app

# Create and run Flask app
app = create_rest_app(port='/dev/ttyACM0', api_port=5000)
app.run_server()

REST API Endpoints

• GET /api/status - Get Modbus connection status
• GET /api/coils/<address> - Read single coil
• GET /api/coils/<address>/<count> - Read multiple coils
• POST /api/coils/<address> - Write single coil
• POST /api/toggle/<address> - Toggle coil state
• GET /api/discrete_inputs/<address>/<count> - Read discrete inputs
• GET /api/holding_registers/<address>/<count> - Read holding registers
• POST /api/holding_registers/<address> - Write holding register
• GET /api/input_registers/<address>/<count> - Read input registers
• GET /api/scan - Scan for Modbus devices
• GET /api/docs - Get API documentation

MQTT API

from modbusapi import start_mqtt_broker

# Start MQTT client
client = start_mqtt_broker(
    port='/dev/ttyACM0',
    mqtt_broker='localhost',
    mqtt_port=1883,
    mqtt_topic_prefix='modbus'
)

MQTT Topics

• modbus/command/read_coil/<address>/<count> - Read coils
• modbus/command/write_coil/<address> - Write coil
• modbus/command/toggle_coil/<address> - Toggle coil
• modbus/command/read_discrete_input/<address>/<count> - Read discrete inputs
• modbus/command/read_holding_register/<address>/<count> - Read holding registers
• modbus/command/write_holding_register/<address> - Write holding register
• modbus/command/read_input_register/<address>/<count> - Read input registers
• modbus/status - Connection status

Configuration

ModbusAPI can be configured using environment variables or directly in code:

# .env file
MODBUS_PORT=/dev/ttyACM0
MODBUS_BAUDRATE=9600
MODBUS_TIMEOUT=1.0
MODBUS_DEVICE_ADDRESS=1

Development

# Install development dependencies
pip install -e .[dev]

# Run tests
pytest

License

Apache 2.0